BS EN 81-43-2009 pdf download.Safety rules for the construction and installation of lifts Special lifts for the transport of persons and goods Part 43: Lifts for cranes.
5.2.5.1 A fatigue stress analysis shall be made for all load bearing components and joints which are critical to fatigue, such as shafts and gearing. This analysis shall take into account the degree of stress fluctuation and the number of stress cycles, which can be a multiple of the number of load cycles.
To determine the number of stress cycles, the manufacturer shall take the following into account:
a) 50 % of the movements with 50 % of the rated load in the car;
b) 50 % of the movements with empty car:
C) for the calculation of the drives each movement consists of acceleration from rest to rated speed travel at rated speed for nominal travel distance — deceleration to full stop. (see also 7.1.2.10).
For each component the least favourable combination of upwards and downwards movements shall be taken into account.
The number of movements is based on 1.6 x 1 o — intermittent duty (e.g. 20 years. 50 weeks per year,
80 hours per week, 1 movement per hour). Nominal travel distance shall be 35 m.
The number of movements for lifts installed on tower cranes under construction site conditions is based on
1,6 x io — intermittent duty (e.g. 10 years, 40 weeks per year, 40 movements per week). Nominal travel
distance shall be 50 m.
5.2.5.2 Each shaft shall possess a minimum safety factor of 2,0 against the appropriate endurance limit. taking into account all notch effects.
5.3 Base frame
The base frame shall be designed to accommodate all forces acting on it generated by the lift and be able to transfer them onto the supporting surface. Special consideration shall be given to the forces described in 5.2.2.12.
5.4 Mast, ties and buffers
5.4.1 Guide rails and masts
5.4.1.1 The car shall be guided by rigid guide rails and elements allowing only travel of the car in the intended direction. The car shall be guided over its full length of travel including the overrun at top and bottom,
The deflection for temporary lifts of any part of the car, guide rails and elements shall be limited such that no collision (e.g. with the landings) can occur (under all circumstances). The operational clearances specified in the standard shall always be maintained. For permanent lifts the requirements in EN 81-1:1998, Clause 10.1.22 applies.
5.4.1.5 Attachments of drive elements (e.g. rack) to the mast shall ensure that the drive element is kept in correct position so that the stipulated loads can be transferred to the mast and that the fixings are ensured from coming loose.
5.4.2 Ties for mast and guide rails
The ties shall be so designed that they take care of the movements of the supporting structures (e.g. tower crane mast) and withstand the load cases according to 5.2. Special attention shall be paid to forces generated during erection and dismantling.
5.4.3 Buffers
5.4.3.1 The travel of the car shall be limited at the bottom of its travel by buffers.
5.4.3.2 With rated load in the car and at a speed equal to triggering speed of the overspeed safety device, the average retardation of the car duflng action of the buffers shall not exceed 1 g. with no peak exceeding 2,5 g for more than 0,04 seconds (consider rated load in the car plus Inertia effects of the motors). (see 5.2.2.11)
5.4.3.3 If fitted, oil buffers shall be provided with a means for checking the oil level, An electrical safety switch shall monitor the stroke of the oil buffer so that the car cannot be driven by the normal operating means unless the buffer is in its normal extended position.
5.5 Liftway protection and landing access
5.5.1 General
A lift, when installed for use, shall have a protected liftway and protected landings.
These shall prevent persons from being struck by moving parts, and from falling from a height.
5.5.2 Liftway protection
5.5.2.1 Where the vertical distance between any part of the car, when resting on fully compressed buffers, and an accessible base level is less than 2,5 m, a lift base enclosure shall protect all sides to a height of at least 2,0 m and shall conform to 5.5.4 and EN ISO 13857:2008, Table 1.
5.5.2.2 When, eg. for maintenance purposes, the base enclosure is accessed by the landing gate at base level, this shall be openable from the inside without a key or any tool.
5.5.2.3 In order to prevent falling from a height down the liftway guards shall be provided in accordance with EN 13586:2004+A1:2008, Table 7.BS EN 81-43-2009 pdf download.